Vat for screening paper-pulp.



No. 657,186. Patented Sept. 4, I900. H. E. WAMBOLD. VAT FOR SCREENINGPAPER PULP.

(Application filed Jan. 16, 1900.)

(No Model.)

,smrncnms PETERS co worauwo WASHINGTOK n c UNTTED STATES PATENT O F CE.

HARRY E. WAMBOLD, OF APPLETON, W'ISCONSIN.

VAT FOR SCREENING PAPER-FQULP.

SPECIFICATION forming pea of Letters Patent No. 657,186, dated September4, 1900. Application filed January 16, 1900. Serial No. 1,594. Nomodel.)

To CLZZ whom it may concern:

Be it known that I, HARRY E. WAMBoLD, a citizen of the United States,residing at Appleton, in the county of Qutagamie and State of Wisconsin,have invented new and useful Improvements in Vats for Screening Paper-Pulp, of which the following is a specification.

My invention relates to improvements in paper-pulp and filter vats, andit pertains more especially to the device for locking and holding thescreen -plates which form the floor of the vat to their supportingbed-pieces.

My invention is explained by reference to the accompanying drawings, inwhich-- Figure 1 represents a vertical section of a portion of the vat,drawn at right angles to the screen-plates. Fig. 2 represents a plan ofa portion of the vat with a part of the screenplates broken away to showthe supporting bed-pieces.

Like parts are referred to by the same reference-letters in both views.

The walls A, screen-supporting bed-pieces B, and inclosing frame 0 ofthe vat are all of the ordinary construction.

D represents a number of screen -plates which form the floor of the vat.The screenplates D are preferably formed of metal and are provided witha series of fine slots E, through which the finer part of the pulpplaced in the vat is screened out. Heretofore it has been common to formthe screen-plates with plain vertical edges which are brought in directcontact witlreaoh other and the walls of the vat, in which case itbecomes necessary to provide each edge of each screenplate with aseparate series of holes for the plate-retaining screws, and as suchscrews extend into the supporting bed-pieces it becomes necessary toform the bed pieces of sufficient thickness to permit of two series ofretaining-screw holes, and owing to the fact that the screen-plates arefrequently changed for others in which screw-holes are not located inthe same relative position to each otherit often becomes necessary tomake new holes for such screws, whereby the bedpieces soon become cutaway and weakened, while the amount of labor and trouble of changing thescreen-plates and forming new holes for the retaining-screws isnecessarily large. By my improvement the holes in the screen-plates areentirely avoided and a sin gle series of holes G only is required ineach supporting bed-piece. This desired object is 5 5 accomplished byinterposing between each of the several screen-plates and between thesides of the screen-plates and edges of the vat a separate fastening orlooking plate F, through which the retaining-bolts H are iii serted andby which said retaining e bolts are drawn down firmly upon the beveledges of the screen-plate B. The locking-plates F are beveled on theirlower sides, While the opposing edges of thescreen-plates D are beveledon their upper sides for the reception of the locking-plates, the bevelof the respective plates being formed on the same angle, so that suchparts fit nicely together and form asmooth even surface, while the holesI, formed in the several lockingplates for the reception of thefastening-bolts, are countersunk, so that the upper surface of the headsof such bolts will when in place be flush with the surface of thescreen-plates, as shown in Fig. 1. To prevent the screenplates frombeing separated or forced away from each other by said locking-plates asthe same are drawn down by their retainingbolts, an interlocking jointis formed between such parts, consisting of a V or U shaped groove J andflange J, formed in the beveled surface of the screen-plates, and a V orU shaped flange K and groove K, conforming in shape to said groove andflange formed on the lower side of said lockingplates, which saidflanges and grooves on one plate engage in the flanges and grooves onthe other plate and lock such parts securely together, wherebyit isobvious that the act of drawing down 0 said plates has no tendency toforce back the screen-plates, as would be the case were such V or Ushaped flanges and grooves dispensed with.

To prevent the lower edges of the bed-piece B from being ohafed orbroken by contact with the nuts L as they are turned down on the bolts,I preferably employa cap or washer M, which cap is provided with angularflanges N, which flanges engage the respective sur- I00 faces of saidbed-pieces, and thus distribute the pressure of the nuts over a largerarea of e mis surface and prevent the injurious action of the nut thanwould otherwise occur if turned down on said bed-pieces direct.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

In vabfor fi erin d s eenin Panel'- pulp, the combination'of a series ofscreenplates having beveled edges; a series of loci;- ing-plates havinginversely-beveled edges", the opposing surfaces of said screen and lock;in g-plates having interlocking flanges and grooves, the edges of saidscreen a'ndlocki-iig plates interlocking together; and means forsecuring said locking-plates in place upon th b e ge o thescreempla siih1 t nt y as a d f r thePi rPO-Sje sn c fisili 2- 1 1 aw er tring'atdscre e a Irina:

pulp, the combination, of a series of screenplates having beveledinterlocking edges; a series of locking-plates provided with boltholesfor the reception of retaining-bolts, and having beveled interlockingedges; a series of bed-pieces longitudinally arranged beneath saidlocking-plates; and a series of bolts passing through saidlocking-plates and secured at their lower ends to said longitudinalbed-' piecesfall substantially as and for the purpose specified.

In testimony whereof I affix my signature in the pres'en'c'e of twowitnesses.

HARRY E. \VAMBOLD.

Witnesses:

W- F M NrGQ E F A K Catrina Jr-

